Dynamic stability enhancement using an adaptive Unified Power Flow Controller

An adaptive Unified Power Flow Controller (UPFC) in single machine infinite bus system is proposed. The UPFC model consists of a voltage source. The magnitude and angle of this voltage source depends on the UPFC control parameters. For the eigen value analysis, a linearized power system model is developed. The stabilizing signal controls the electromechanical mode which is poorly damped. The singular value decomposition based approach is used to select this superior stabilizing signal. The voltage source model of UPFC incorporated into the generator output power equation simplifies the dynamic analysis of the system and this incorporation into the generator output power equation can be easily done. This model which is proposed can be then used to compare and determine a simple system´s dynamic behavior, equipped with an adaptive UPFC.